Year | Value | 2022 | 14.146485562123 | 2021 | 14.011417678594 | 2020 | 14.00249256676 | 2019 | 14.304681587869 | 2018 | 14.692924851904 | 2017 | 15.219171055836 | 2016 | 16.690395181821 | 2015 | 17.109091442805 | 2014 | 17.568555618749 | 2013 | 17.988476230241 | 2012 | 18.41066221336 | 2011 | 18.848645468168 | 2010 | 18.784300885061 | 2009 | 18.666901727153 | 2008 | 18.63615967768 | 2007 | 18.500665108772 | 2006 | 18.346854352379 | 2005 | 18.201550370014 | 2004 | 18.018566234967 | 2003 | 17.796875172506 | 2002 | 17.577605570615 | 2001 | 17.490354929309 | 2000 | 17.436958977131 | 1999 | 17.297100579657 | 1998 | 17.232043502485 | 1997 | 17.258673571226 | 1996 | 17.254059203326 | 1995 | 17.234157837961 | 1994 | 17.193192369239 | 1993 | 17.20788568785 | 1992 | 17.238461693116 | 1991 | 17.237182457213 |
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